Lines Matching full:pwm
11 #include <linux/pwm.h>
21 #include <dt-bindings/pwm/pwm.h>
24 #include <trace/events/pwm.h>
35 static struct pwm_device *pwm_to_device(unsigned int pwm) in pwm_to_device() argument
37 return radix_tree_lookup(&pwm_tree, pwm); in pwm_to_device()
58 struct pwm_device *pwm = &chip->pwms[i]; in free_pwms() local
60 radix_tree_delete(&pwm_tree, pwm->pwm); in free_pwms()
92 static int pwm_device_request(struct pwm_device *pwm, const char *label) in pwm_device_request() argument
96 if (test_bit(PWMF_REQUESTED, &pwm->flags)) in pwm_device_request()
99 if (!try_module_get(pwm->chip->ops->owner)) in pwm_device_request()
102 if (pwm->chip->ops->request) { in pwm_device_request()
103 err = pwm->chip->ops->request(pwm->chip, pwm); in pwm_device_request()
105 module_put(pwm->chip->ops->owner); in pwm_device_request()
110 if (pwm->chip->ops->get_state) { in pwm_device_request()
111 pwm->chip->ops->get_state(pwm->chip, pwm, &pwm->state); in pwm_device_request()
112 trace_pwm_get(pwm, &pwm->state); in pwm_device_request()
115 pwm->last = pwm->state; in pwm_device_request()
118 set_bit(PWMF_REQUESTED, &pwm->flags); in pwm_device_request()
119 pwm->label = label; in pwm_device_request()
127 struct pwm_device *pwm; in of_pwm_xlate_with_flags() local
139 pwm = pwm_request_from_chip(pc, args->args[0], NULL); in of_pwm_xlate_with_flags()
140 if (IS_ERR(pwm)) in of_pwm_xlate_with_flags()
141 return pwm; in of_pwm_xlate_with_flags()
143 pwm->args.period = args->args[1]; in of_pwm_xlate_with_flags()
144 pwm->args.polarity = PWM_POLARITY_NORMAL; in of_pwm_xlate_with_flags()
148 pwm->args.polarity = PWM_POLARITY_INVERSED; in of_pwm_xlate_with_flags()
151 return pwm; in of_pwm_xlate_with_flags()
163 if (of_property_read_u32(chip->dev->of_node, "#pwm-cells", in of_pwmchip_add()
181 * pwm_set_chip_data() - set private chip data for a PWM
182 * @pwm: PWM device
187 int pwm_set_chip_data(struct pwm_device *pwm, void *data) in pwm_set_chip_data() argument
189 if (!pwm) in pwm_set_chip_data()
192 pwm->chip_data = data; in pwm_set_chip_data()
199 * pwm_get_chip_data() - get private chip data for a PWM
200 * @pwm: PWM device
202 * Returns: A pointer to the chip-private data for the PWM device.
204 void *pwm_get_chip_data(struct pwm_device *pwm) in pwm_get_chip_data() argument
206 return pwm ? pwm->chip_data : NULL; in pwm_get_chip_data()
235 * pwmchip_add() - register a new PWM chip
236 * @chip: the PWM chip to add
238 * Register a new PWM chip.
244 struct pwm_device *pwm; in pwmchip_add() local
262 chip->pwms = kcalloc(chip->npwm, sizeof(*pwm), GFP_KERNEL); in pwmchip_add()
269 pwm = &chip->pwms[i]; in pwmchip_add()
271 pwm->chip = chip; in pwmchip_add()
272 pwm->pwm = chip->base + i; in pwmchip_add()
273 pwm->hwpwm = i; in pwmchip_add()
275 radix_tree_insert(&pwm_tree, pwm->pwm, pwm); in pwmchip_add()
299 * pwmchip_remove() - remove a PWM chip
300 * @chip: the PWM chip to remove
302 * Removes a PWM chip. This function may return busy if the PWM chip provides
303 * a PWM device that is still requested.
344 * pwm_request() - request a PWM device
345 * @pwm: global PWM device index
346 * @label: PWM device label
350 * Returns: A pointer to a PWM device or an ERR_PTR()-encoded error code on
353 struct pwm_device *pwm_request(int pwm, const char *label) in pwm_request() argument
358 if (pwm < 0 || pwm >= MAX_PWMS) in pwm_request()
363 dev = pwm_to_device(pwm); in pwm_request()
381 * pwm_request_from_chip() - request a PWM device relative to a PWM chip
382 * @chip: PWM chip
383 * @index: per-chip index of the PWM to request
384 * @label: a literal description string of this PWM
386 * Returns: A pointer to the PWM device at the given index of the given PWM
388 * specified PWM chip or if the PWM device cannot be requested.
394 struct pwm_device *pwm; in pwm_request_from_chip() local
401 pwm = &chip->pwms[index]; in pwm_request_from_chip()
403 err = pwm_device_request(pwm, label); in pwm_request_from_chip()
405 pwm = ERR_PTR(err); in pwm_request_from_chip()
408 return pwm; in pwm_request_from_chip()
413 * pwm_free() - free a PWM device
414 * @pwm: PWM device
418 void pwm_free(struct pwm_device *pwm) in pwm_free() argument
420 pwm_put(pwm); in pwm_free()
424 static void pwm_apply_state_debug(struct pwm_device *pwm, in pwm_apply_state_debug() argument
427 struct pwm_state *last = &pwm->last; in pwm_apply_state_debug()
428 struct pwm_chip *chip = pwm->chip; in pwm_apply_state_debug()
444 chip->ops->get_state(chip, pwm, &s1); in pwm_apply_state_debug()
445 trace_pwm_get(pwm, &s1); in pwm_apply_state_debug()
500 err = chip->ops->apply(chip, pwm, &s1); in pwm_apply_state_debug()
507 trace_pwm_apply(pwm, &s1); in pwm_apply_state_debug()
509 chip->ops->get_state(chip, pwm, last); in pwm_apply_state_debug()
510 trace_pwm_get(pwm, last); in pwm_apply_state_debug()
526 * pwm_apply_state() - atomically apply a new state to a PWM device
527 * @pwm: PWM device
530 int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state) in pwm_apply_state() argument
535 if (!pwm || !state || !state->period || in pwm_apply_state()
539 chip = pwm->chip; in pwm_apply_state()
541 if (state->period == pwm->state.period && in pwm_apply_state()
542 state->duty_cycle == pwm->state.duty_cycle && in pwm_apply_state()
543 state->polarity == pwm->state.polarity && in pwm_apply_state()
544 state->enabled == pwm->state.enabled && in pwm_apply_state()
545 state->usage_power == pwm->state.usage_power) in pwm_apply_state()
549 err = chip->ops->apply(chip, pwm, state); in pwm_apply_state()
553 trace_pwm_apply(pwm, state); in pwm_apply_state()
555 pwm->state = *state; in pwm_apply_state()
558 * only do this after pwm->state was applied as some in pwm_apply_state()
561 pwm_apply_state_debug(pwm, state); in pwm_apply_state()
566 if (state->polarity != pwm->state.polarity) { in pwm_apply_state()
571 * Changing the polarity of a running PWM is in pwm_apply_state()
572 * only allowed when the PWM driver implements in pwm_apply_state()
575 if (pwm->state.enabled) { in pwm_apply_state()
576 chip->ops->disable(chip, pwm); in pwm_apply_state()
577 pwm->state.enabled = false; in pwm_apply_state()
580 err = chip->ops->set_polarity(chip, pwm, in pwm_apply_state()
585 pwm->state.polarity = state->polarity; in pwm_apply_state()
588 if (state->period != pwm->state.period || in pwm_apply_state()
589 state->duty_cycle != pwm->state.duty_cycle) { in pwm_apply_state()
590 err = chip->ops->config(pwm->chip, pwm, in pwm_apply_state()
596 pwm->state.duty_cycle = state->duty_cycle; in pwm_apply_state()
597 pwm->state.period = state->period; in pwm_apply_state()
600 if (state->enabled != pwm->state.enabled) { in pwm_apply_state()
602 err = chip->ops->enable(chip, pwm); in pwm_apply_state()
606 chip->ops->disable(chip, pwm); in pwm_apply_state()
609 pwm->state.enabled = state->enabled; in pwm_apply_state()
618 * pwm_capture() - capture and report a PWM signal
619 * @pwm: PWM device
625 int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result, in pwm_capture() argument
630 if (!pwm || !pwm->chip->ops) in pwm_capture()
633 if (!pwm->chip->ops->capture) in pwm_capture()
637 err = pwm->chip->ops->capture(pwm->chip, pwm, result, timeout); in pwm_capture()
645 * pwm_adjust_config() - adjust the current PWM config to the PWM arguments
646 * @pwm: PWM device
648 * This function will adjust the PWM config to the PWM arguments provided
649 * by the DT or PWM lookup table. This is particularly useful to adapt
652 int pwm_adjust_config(struct pwm_device *pwm) in pwm_adjust_config() argument
657 pwm_get_args(pwm, &pargs); in pwm_adjust_config()
658 pwm_get_state(pwm, &state); in pwm_adjust_config()
661 * If the current period is zero it means that either the PWM driver in pwm_adjust_config()
662 * does not support initial state retrieval or the PWM has not yet in pwm_adjust_config()
673 return pwm_apply_state(pwm, &state); in pwm_adjust_config()
677 * Adjust the PWM duty cycle/period based on the period value provided in pwm_adjust_config()
678 * in PWM args. in pwm_adjust_config()
696 return pwm_apply_state(pwm, &state); in pwm_adjust_config()
718 struct pwm_device *pwm) in pwm_device_link_add() argument
724 * No device for the PWM consumer has been provided. It may in pwm_device_link_add()
725 * impact the PM sequence ordering: the PWM supplier may get in pwm_device_link_add()
728 dev_warn(pwm->chip->dev, in pwm_device_link_add()
733 dl = device_link_add(dev, pwm->chip->dev, DL_FLAG_AUTOREMOVE_CONSUMER); in pwm_device_link_add()
736 dev_name(pwm->chip->dev)); in pwm_device_link_add()
744 * of_pwm_get() - request a PWM via the PWM framework
745 * @dev: device for PWM consumer
746 * @np: device node to get the PWM from
749 * Returns the PWM device parsed from the phandle and index specified in the
751 * Values parsed from the device tree are stored in the returned PWM device
754 * If con_id is NULL, the first PWM device listed in the "pwms" property will
755 * be requested. Otherwise the "pwm-names" property is used to do a reverse
756 * lookup of the PWM index. This also means that the "pwm-names" property
757 * becomes mandatory for devices that look up the PWM device via the con_id
760 * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
766 struct pwm_device *pwm = NULL; in of_pwm_get() local
774 index = of_property_match_string(np, "pwm-names", con_id); in of_pwm_get()
779 err = of_parse_phandle_with_args(np, "pwms", "#pwm-cells", index, in of_pwm_get()
789 pr_err("%s(): PWM chip not found\n", __func__); in of_pwm_get()
791 pwm = ERR_CAST(pc); in of_pwm_get()
795 pwm = pc->of_xlate(pc, &args); in of_pwm_get()
796 if (IS_ERR(pwm)) in of_pwm_get()
799 dl = pwm_device_link_add(dev, pwm); in of_pwm_get()
802 pwm_free(pwm); in of_pwm_get()
803 pwm = ERR_CAST(dl); in of_pwm_get()
809 * "pwm-names" property if it exists. Otherwise use the name of in of_pwm_get()
813 err = of_property_read_string_index(np, "pwm-names", index, in of_pwm_get()
819 pwm->label = con_id; in of_pwm_get()
824 return pwm; in of_pwm_get()
829 * acpi_pwm_get() - request a PWM via parsing "pwms" property in ACPI
832 * Returns the PWM device parsed from the fwnode and index specified in the
834 * Values parsed from the device tree are stored in the returned PWM device
840 * { <PWM device reference>, <PWM index>, <PWM period> [, <PWM flags>]}}
842 * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
847 struct pwm_device *pwm; in acpi_pwm_get() local
865 pwm = pwm_request_from_chip(chip, args.args[0], NULL); in acpi_pwm_get()
866 if (IS_ERR(pwm)) in acpi_pwm_get()
867 return pwm; in acpi_pwm_get()
869 pwm->args.period = args.args[1]; in acpi_pwm_get()
870 pwm->args.polarity = PWM_POLARITY_NORMAL; in acpi_pwm_get()
873 pwm->args.polarity = PWM_POLARITY_INVERSED; in acpi_pwm_get()
875 return pwm; in acpi_pwm_get()
879 * pwm_add_table() - register PWM device consumers
896 * pwm_remove_table() - unregister PWM device consumers
913 * pwm_get() - look up and request a PWM device
914 * @dev: device for PWM consumer
918 * a device tree, a PWM chip and a relative index is looked up via a table
921 * Once a PWM chip has been found the specified PWM device will be requested
924 * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
931 struct pwm_device *pwm; in pwm_get() local
945 pwm = acpi_pwm_get(fwnode); in pwm_get()
946 if (!IS_ERR(pwm) || PTR_ERR(pwm) != -ENOENT) in pwm_get()
947 return pwm; in pwm_get()
957 * If a match is found, the provider PWM chip is looked up by name in pwm_get()
958 * and a PWM device is requested using the PWM device per-chip index. in pwm_get()
1008 * the PWM chip lookup. This can be used to work around driver load in pwm_get()
1021 pwm = pwm_request_from_chip(chip, chosen->index, con_id ?: dev_id); in pwm_get()
1022 if (IS_ERR(pwm)) in pwm_get()
1023 return pwm; in pwm_get()
1025 dl = pwm_device_link_add(dev, pwm); in pwm_get()
1027 pwm_free(pwm); in pwm_get()
1031 pwm->args.period = chosen->period; in pwm_get()
1032 pwm->args.polarity = chosen->polarity; in pwm_get()
1034 return pwm; in pwm_get()
1039 * pwm_put() - release a PWM device
1040 * @pwm: PWM device
1042 void pwm_put(struct pwm_device *pwm) in pwm_put() argument
1044 if (!pwm) in pwm_put()
1049 if (!test_and_clear_bit(PWMF_REQUESTED, &pwm->flags)) { in pwm_put()
1050 pr_warn("PWM device already freed\n"); in pwm_put()
1054 if (pwm->chip->ops->free) in pwm_put()
1055 pwm->chip->ops->free(pwm->chip, pwm); in pwm_put()
1057 pwm_set_chip_data(pwm, NULL); in pwm_put()
1058 pwm->label = NULL; in pwm_put()
1060 module_put(pwm->chip->ops->owner); in pwm_put()
1066 static void devm_pwm_release(void *pwm) in devm_pwm_release() argument
1068 pwm_put(pwm); in devm_pwm_release()
1073 * @dev: device for PWM consumer
1076 * This function performs like pwm_get() but the acquired PWM device will
1079 * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
1084 struct pwm_device *pwm; in devm_pwm_get() local
1087 pwm = pwm_get(dev, con_id); in devm_pwm_get()
1088 if (IS_ERR(pwm)) in devm_pwm_get()
1089 return pwm; in devm_pwm_get()
1091 ret = devm_add_action_or_reset(dev, devm_pwm_release, pwm); in devm_pwm_get()
1095 return pwm; in devm_pwm_get()
1101 * @dev: device for PWM consumer
1102 * @np: device node to get the PWM from
1105 * This function performs like of_pwm_get() but the acquired PWM device will
1108 * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
1114 struct pwm_device *pwm; in devm_of_pwm_get() local
1117 pwm = of_pwm_get(dev, np, con_id); in devm_of_pwm_get()
1118 if (IS_ERR(pwm)) in devm_of_pwm_get()
1119 return pwm; in devm_of_pwm_get()
1121 ret = devm_add_action_or_reset(dev, devm_pwm_release, pwm); in devm_of_pwm_get()
1125 return pwm; in devm_of_pwm_get()
1130 * devm_fwnode_pwm_get() - request a resource managed PWM from firmware node
1131 * @dev: device for PWM consumer
1132 * @fwnode: firmware node to get the PWM from
1135 * Returns the PWM device parsed from the firmware node. See of_pwm_get() and
1138 * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
1145 struct pwm_device *pwm = ERR_PTR(-ENODEV); in devm_fwnode_pwm_get() local
1149 pwm = of_pwm_get(dev, to_of_node(fwnode), con_id); in devm_fwnode_pwm_get()
1151 pwm = acpi_pwm_get(fwnode); in devm_fwnode_pwm_get()
1152 if (IS_ERR(pwm)) in devm_fwnode_pwm_get()
1153 return pwm; in devm_fwnode_pwm_get()
1155 ret = devm_add_action_or_reset(dev, devm_pwm_release, pwm); in devm_fwnode_pwm_get()
1159 return pwm; in devm_fwnode_pwm_get()
1169 struct pwm_device *pwm = &chip->pwms[i]; in pwm_dbg_show() local
1172 pwm_get_state(pwm, &state); in pwm_dbg_show()
1174 seq_printf(s, " pwm-%-3d (%-20.20s):", i, pwm->label); in pwm_dbg_show()
1176 if (test_bit(PWMF_REQUESTED, &pwm->flags)) in pwm_dbg_show()
1218 seq_printf(s, "%s%s/%s, %d PWM device%s\n", (char *)s->private, in pwm_seq_show()
1239 debugfs_create_file("pwm", S_IFREG | 0444, NULL, NULL, in pwm_debugfs_init()